claver vs yatter

claver

noun
  • Frivolous or nonsensical talk; prattle; chatter. 

verb
  • To gossip or chit-chat. 

yatter

noun
  • Natter; prattle; mindless chatter. 

verb
  • To natter; to prattle; to chatter mindlessly. 

How often have the words claver and yatter occurred in a corpus of books? (source: Google Ngram Viewer )